Scientists are still trying to figure out what's causing CCD, or Colony Collapse Disorder, a plague that's killing off millions of bee across the United States. Among the possible culprits are a virus, increased vulnerability to disease due to breeding, overwork (hives of bees are trucked around the country for months to pollinate crops), increased exposure to all kinds of insecticides, and perhaps even all of the above.
Whatever the cause, Aaron Hirsh says, the way to keep our crops pollinated could be simple: restore habitats for wild bees near crops that need to be pollinated.
As the swift expansion of feral honeybees across the Americas shows, they are not especially picky about their habitat; most anything outside of parking lot or vast monoculture will do. And for native bees, habitat could be restored to suit the needs of whichever species are exceptionally good pollinators of local crops. Bumblebees, for instance, are the best pollinators of Maine blueberries, whereas blue orchard bees work well for California almonds.
Hirsh's idea is reminiscent of Michael Pollan's proposals for decreasing the present monoculture in American agriculture outlined in his recent books.
Update: See also Beekeeping Backwards. (thx, david)